remove dependency on missing gin-contrib/zap replacement

[DoctorVin]

That replacement repo is gone now and blocking other folks building/developing things. Using an updated, vanilla gin-contrib/zap replaces neatly and tests clean.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.72%. Comparing base (d1ebd1b) to head (ebdd5b9).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #32      +/-   ##
==========================================
+ Coverage   72.69%   72.72%   +0.02%     
==========================================
  Files          38       38              
  Lines        3736     3740       +4     
==========================================
+ Hits         2716     2720       +4     
  Misses        762      762              
  Partials      258      258              

Flag	Coverage Δ
unittests	72.72% <100.00%> (+0.02%)	⬆️

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